摘要
以微晶菱镁矿为原料,经轻烧、消化制得Mg(OH)2乳液,通过引入MgCl_2,以有效除去其中的杂质钙离子。分别了研究MgCl_2掺量、反应时间、反应温度、轻烧温度及轻烧保温时间对除钙效果的影响。结果表明:MgCl_2对微晶菱镁矿轻烧镁粉的除钙效果确有明显改善作用;920℃条件下煅烧2h得到的轻烧镁粉在消化反应后,通过加入8%的MgCl_2溶液反应1.5 h,可以得到w(MgO)≥99.45%、w(CaO)≤0.20%的高纯Mg(OH)_2前驱体;除钙工艺对温度的适应性较大,室温环境下除钙效果良好且稳定。
Magnesium hydroxide（ MH） emulsion was prepared using microcrystalline magnesite as raw material by lightly calcination and digestion. It is found that Ca impurities can be effectively removed by adding MgCl2. In this paper,the Ca-removing effects of MgCl2 content,reaction time,reaction temperature,calcination temperature and sintering time during the whole process of impurity removal was investigated. The experimental results showed that the Ca-removing effect on light burned magnesium was obviously improved by mixing MgCl2. The preparation of high-purity MH precursor which contained 99. 45% of magnesium oxide and 0. 20% of calcium oxide includes the following steps：（ 1） calcining the microcrystalline magnesite at 920 ℃ for 2 h;（ 2） hydrating the light burned magnesium to be slurry;（ 3） adding 8% of MgCl2 into the slurry and reacting for 1. 5 h. It is also proved that the Ca removal could be finished in a wide temperature range,and achieved a better and stable result in indoor environment.
作者
金汝
刘百宽
冯润棠
田晓利
李志勋
杨树
JIN Ru;LIU Bai-kuan;FENG Run-tang;TIAN Xiao-li;LI Zhi-xun;YANG Shu(College of Material and Mineral Resources,Xian University of Architecture and Technology,Xian 710055,China;PRCO Technology Center,Puyang 457100,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第5期1600-1604,共5页
Bulletin of the Chinese Ceramic Society
关键词
微晶菱镁矿
除钙
氯化镁
高纯氧化镁
microcrystalline magnesite
Ca removal
magnesium chloride
high-purity magnesium oxide
